Damage like that could happen to almost anybody; I know I've had some close calls with tree branches that were hard to see.
The first thing to do, I think, is to prevent water leaks due to the damage. You could temporarily use duct tape or Eternabond tape or almost anything that will cover up the holes.
Do you have collision insurance on your trailer? If so, this damage is probably covered.
If you want to repair it yourself it would be possible, but it does sound intimidating - especially if you don't have a weather proof area to park the trailer in while you are making the repairs. You'd probably have to order the new panel from Jayco. I don't think you can just slip in a new panel, I think you have to start at the top or the bottom and remove panels, moldings, that window and other bits and pieces until you can get to the damaged panel out.
Was there any damage inside?
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch